Description
Technical description: Five tuning forks of polished steel; from details of design it appears that (482a) and (482d) are from one set, (482b) and (482e) are from another, and (482c) from another.
Stamped (482a) on front and back of shank "F"; (482b) on front of shank "F"; (482c) on front and back of shank "F / b "; (482d) on front and back of shank "E"; (482e) on front of shank "E".
Usable pitch: (482a), measured frequency +/- 0.1 cents, 691.09 Hz; -18.4 cents with respect to A4 = 440 Hz; equivalent to F5 at A4 = 435.3 Hz. (482b), measured frequency +/- 0.1 cents, 681.33 Hz; -43.0 cents with respect to A4 = 440 Hz; equivalent to F5 at A4 = 429.2 Hz. (482c), measured frequency +/- 0.1 cents, 678.43 Hz; -50.4 cents with respect to A4 = 440 Hz; equivalent to F5 at A4 = 427.4 Hz. (482d), measured frequency +/- 0.1 cents, 649.90 Hz; -24.8 cents with respect to A4 = 440 Hz; equivalent to E5 at A4 = 433.7 Hz. (482e), measured frequency +/- 0.1 cents, 646.53 Hz; -33.8 cents with respect to A4 = 440 Hz; equivalent to E5 at A4 = 431.5 Hz. |